edited by Edwin J. Thomas
Free Press, 1967
Buku Teks
Seidler, Lee J., author
[publisher not identified], 1975
Buku Teks
edited by Merwin M. Hargrove, Ike H. Harrison and Eugene L. Swearingen
Irwin, 1966
Buku Teks
Sawyer, R. Keith, author
Oxford University Press, 2006
Buku Teks
Burke, Shirley R., author
John Wiley & Sons, 1980
Buku Teks